Here’s a concise breakdown of costs, factors, and key details for adding plumbing to a detached garage or shed.

Average Costs

• Cost per Linear Foot:
• Copper: $2–$12
• CPVC: $0.50–$3

• PEX: $0.40–$4

• Labor Rates:

• Plumber: $45–$200/hour
• Electrician: $50–$100/hour

• Excavation: $5–$12 per foot

• Fixture Installation:

• Sink: $150–$800
• Toilet: $250–$550
• Shower: $600–$1,600
• Bathtub: $400–$1,900

Major Cost Factors

• Distance from House:
  The farther the garage/shed, the higher the trenching and pipe costs.

• Building Size:
  Larger structures require more plumbing materials and higher labor.

• Number of Fixtures:
  Each added sink, toilet, or shower increases costs.

• Piping Material:

• Copper: Durable but costly.
• PEX: Flexible and affordable but less compatible with older systems.

• CPVC: Inexpensive but less durable than copper.

• Excavation:
  Essential for underground pipes. Costs $100–$240 for 20 feet.

• Permits:
  $100–$300 per permit, depending on local regulations.

Additional Services and Costs

• Electrical Work: $1,000–$3,000 for running electricity to plumbing fixtures.
• Wall Demolition & Framing: $1,000–$5,000, depending on extent.
• Drainage Solutions: Options like upflush systems are needed for sunken garages.

DIY vs. Professional Installation

• DIY: Suitable only for small-scale tasks like minor repairs or inspections.
• Professional Help: Strongly recommended for plumbing installation, excavation, and electrical work.

Questions to Ask a Contractor

• Do you have experience with detached structures
• Are you licensed and insured
• How long will the project take
• Can you provide references
• Do you offer a workmanship warranty
• What are your cleanup and dispute resolution policies

Tips to Save Money

• Opt for affordable piping materials like PEX.
• Plan for basic plumbing without luxury fixtures.
• Address plumbing needs early to avoid more costly repairs later.

For a more tailored estimate, contact a licensed plumber or contractor near you!

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